Table 1.
Clinical characteristics of the study sample (3846 individuals free of thyroid disease).
| Number (%) | Mean ± SD | Median | Range | |
|---|---|---|---|---|
| Age (years) | 50.0 ± 17.1 | 18–93 | ||
| Men | 1767 (45.9) | |||
| Premenopausal women | 1081 (28.1) | |||
| Postmenopausal women | 998 (25.9) | |||
| Currently smoking | 1023 (26.6) | |||
| BMI (kg/m2) | 28.0 ± 5.1 | 12.2–61.3 | ||
| Ferritin (µg/L) | ||||
| <15 | 523 (13.6) | |||
| 15–30 | 554 (14.4) | |||
| 30–100 | 1473 (38.3) | |||
| ≥100 | 1296 (33.7) | |||
| UI (μg/g) | 133.8 ± 80.6 | 116.1 | 20.0–632.5 | |
| TSH (µUI/mL) | 2.33 ± 1.36 | 2.06 | 0.11–18.50 | |
| FT4 (pmol/L) | 15.13 ± 2.04 | 15.05 | 8.21–26.24 | |
| FT3 (pmol/L) | 5.01 ± 0.72 | 4.95 | 2.59–11.95 |
BMI: Body mass index. UI: Urinary iodine.